Right. I just pinged your ddns address:
root@GL-AXT1800:~# ping -c2 hj82918.glddns.com
PING hj82918.glddns.com ([redacted]): 56 data bytes
64 bytes from [redacted]: seq=0 ttl=44 time=76.975 ms
64 bytes from [redacted]: seq=1 ttl=44 time=76.674 ms
--- hj82918.glddns.com ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 76.674/76.824/76.975 ms
So we know your Opal (acting as the WG Server}, more specifically its publicly facing IP, is online just as we’d expect. That doesn’t assure me :51820 is open to flow through to it though. I could probe it but that might raise some alerts to your ISP so I’m not excited to do that.
Can you please ssh into the device acting as the WG Client (eg: Slate AX per that YT video)? Its default IP is 192.168.8.1. There’s software available to install to scan for open ports on other computers but they only run from the command line hence we can do that once logged into the Slate AX.
(opkg update && opkg install nmap)
Here’s what it looks like when I scan my VPS provider’s WG server:
root@GL-AXT1800:~# nmap -sU -p 51820 37.98.121.77
Starting Nmap 7.80 ( https://nmap.org ) at 2023-07-08 01:08 ADT
Nmap scan report for unn-37-98-121-77.datapacket.com (37.98.121.77)
Host is up (0.042s latency).
PORT STATE SERVICE
51820/udp open|filtered unknown
Nmap done: 1 IP address (1 host up) scanned in 1.55 seconds
Note how it says the WG port, 51820, is open. That’s what we’d be looking for when scanning the IP for your hj82918.glddns.com.